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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-9656 | |||||||||
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Title | Type III-A Csm complex, Cryo-EM structure of Csm-NTR, ATP bound | |||||||||
![]() | The cryo-EM structure of Csm-NTR, ATP bound. | |||||||||
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Function / homology | ![]() exonuclease activity / transferase activity / endonuclease activity / defense response to virus / RNA binding / ATP binding Similarity search - Function | |||||||||
Biological species | ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.4 Å | |||||||||
![]() | You L / Ma J / Wang J / Zhang X / Wang Y | |||||||||
![]() | ![]() Title: Structure Studies of the CRISPR-Csm Complex Reveal Mechanism of Co-transcriptional Interference. Authors: Lilan You / Jun Ma / Jiuyu Wang / Daria Artamonova / Min Wang / Liang Liu / Hua Xiang / Konstantin Severinov / Xinzheng Zhang / Yanli Wang / ![]() ![]() Abstract: Csm, a type III-A CRISPR-Cas interference complex, is a CRISPR RNA (crRNA)-guided RNase that also possesses target RNA-dependent DNase and cyclic oligoadenylate (cOA) synthetase activities. However, ...Csm, a type III-A CRISPR-Cas interference complex, is a CRISPR RNA (crRNA)-guided RNase that also possesses target RNA-dependent DNase and cyclic oligoadenylate (cOA) synthetase activities. However, the structural features allowing target RNA-binding-dependent activation of DNA cleavage and cOA generation remain unknown. Here, we report the structure of Csm in complex with crRNA together with structures of cognate or non-cognate target RNA bound Csm complexes. We show that depending on complementarity with the 5' tag of crRNA, the 3' anti-tag region of target RNA binds at two distinct sites of the Csm complex. Importantly, the interaction between the non-complementary anti-tag region of cognate target RNA and Csm1 induces a conformational change at the Csm1 subunit that allosterically activates DNA cleavage and cOA generation. Together, our structural studies provide crucial insights into the mechanistic processes required for crRNA-meditated sequence-specific RNA cleavage, RNA target-dependent non-specific DNA cleavage, and cOA generation. | |||||||||
History |
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Structure visualization
Movie |
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 28.4 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 17.7 KB 17.7 KB | Display Display | ![]() |
Images | ![]() | 104.6 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 508.6 KB | Display | ![]() |
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Full document | ![]() | 508.1 KB | Display | |
Data in XML | ![]() | 5.7 KB | Display | |
Data in CIF | ![]() | 6.4 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 6ifrMC ![]() 9653C ![]() 9654C ![]() 9655C ![]() 9657C ![]() 9658C ![]() 9659C ![]() 9660C ![]() 6ifkC ![]() 6iflC ![]() 6ifnC ![]() 6ifuC ![]() 6ifyC ![]() 6ifzC ![]() 6ig0C M: atomic model generated by this map C: citing same article ( |
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Similar structure data |
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Links
EMDB pages | ![]() ![]() |
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Map
File | ![]() | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Annotation | The cryo-EM structure of Csm-NTR, ATP bound. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.04 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
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Sample components
+Entire : Csm-NTR complex, ATP bound
+Supramolecule #1: Csm-NTR complex, ATP bound
+Macromolecule #1: Type III-A CRISPR-associated protein Csm1
+Macromolecule #2: Type III-A CRISPR-associated protein Csm2
+Macromolecule #3: Type III-A CRISPR-associated RAMP protein Csm3
+Macromolecule #4: Type III-A CRISPR-associated RAMP protein Csm4
+Macromolecule #5: Type III-A CRISPR-associated RAMP protein Csm5
+Macromolecule #6: type III-A CRISPR-Cas interference complex, crRNA
+Macromolecule #7: type III-A CRISPR-Cas interference complex, NTR
+Macromolecule #8: ADENOSINE-5'-TRIPHOSPHATE
+Macromolecule #9: MAGNESIUM ION
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Concentration | 0.5 mg/mL |
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Buffer | pH: 7.5 |
Vitrification | Cryogen name: ETHANE / Chamber humidity: 60 % / Chamber temperature: 277 K / Instrument: LEICA EM GP |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: SUPER-RESOLUTION / Average electron dose: 60.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
Final reconstruction | Resolution.type: BY AUTHOR / Resolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 54012 |
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Initial angle assignment | Type: ANGULAR RECONSTITUTION |
Final angle assignment | Type: ANGULAR RECONSTITUTION |